/Engine/Source/Runtime/Landscape/Classes/Landscape.h
void SetLayerSubstractiveBlendStatus ( int32 InLayerIndex, bool InStatus, const [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< [ULandscapeLayerInfoObject](API\Runtime\Landscape\ULandscapeLayerInfoObject) > & InLayerInfoObj )